Combined telephone and telegraph system.



G. E. HINES. COMBINED TELEPHONE AND TELEGRAPH SYSTEM.

Ai rmouxon FILED MAY-15, 190s,

Patented Apr. 12, 1910.

v M- De wboz' Ill/Ed @wi/ Mmeo quency GEORGE E. HINES, OF

NEW YORK, N. Y., ASSIGNOB OF ONE-HALF TO WILLIAM T.

, 'DALEY, F BROOKLYN, NEW YORK.

COMBINED TELEPHONE AND TELEGRAPH SYSTEM.

To all whom it may concern:

Be itknown that I, Gnoaon E. Hinze, a citizen of the United States. residing in the city,'county, and State of New York, have invented certain new and useful Improvements in Combined Telephone and Telee graph Systems, of which the following is a full, clear, and exact description.

My invention relates to improvements in combined telegraph and telephone systems, andhas for its object to produce anew and improved combined telegraph and telephone system in which the various difliculties heretofore found to exist in such systems are avoided.

My invention also has for its object to produce a combined telephone system and duplex telegraph system.

Heretofore one of the great diiiiculties in connection with the combination of telegraph and telephone systems, that is, in connection with such a combination that the same conductors are used for transmitting both telephonic and tele raphic messages, has been that the telcgrap signals may not only be detected in a telephonebut are so audible that they'greatly interfere with the telephonic service. This is due to the fact that in the ordinary telegraph system as heretofore used in connection. with combined telephone and telegraph systems, whenever the circuit is opened in sending atelegraph message, a 'static discharge from the coils in circuit takes place, which forms a peak of electromotive force which aifecislhe diaphragm of the telephone. Ilia-re discov-. cred that this 'difliculty can be eliminated by eliminating the static discharge. and I accomplish this end by impressing upon the telephone conductors telegraphic impulses which are 'of' rounded wave form, there being one such wave for each impulse. On account of this wave form the impulses upon the telephone lines are in effect shaded at both the beginning and at the ending, and are in effect single waves of an alternating current and are of such low freas compared with telephonic cur: rents as to produce'no'e'ff'ect upon the diaphragms of the telephones.

The following isa description of my system, reference being had to the accompanyiu drawing, which represents diagrammatica ly the circuits and elements of my system.

Specification of Letters Patent.

Application filed May 15, 1908. Serial No. 432,971..

' arrangementat one station or with windings Patented Apr. 12',

The upper part of the drawin re resents a composite used in combine te ephone and telegraph systems. In this composite AA'. are the leads of an all-metallic tele-.

phone circuit. B-B are telephone switches connected thereto throu h condensers C-C'. D-D are impedance coils connected in multiple to said switches and having their windings connected at, an intermediate, point d to the ground. E-E are other impedance coils each differentially wound, which are in series with the telegraphic transmitting and receiving apparatus.- A separate set of telegraphic receiving and transmitting apparatus can be connected to each lead. For the purpose of illustration, however, I have shown in set connected to one lead.

I will describe in detail the system and terminal only. Theconnections and the telegraphic apparatus at the opposite end are identical.

Referring now ratusF is a transformer having a, laminated closed magnetic .circuit having its secondary G in series with the main conductor A and HH on a relay B. One terminal of this secondary G is connected to ground an, preferably through an inductance coil J. I i

L is the primary of the transformer in series with an ohmic resistance Q. and the transmitting key vN, one contact of which is grounded at- O. The transmitting kc is shunted by a small condenser P in series with an ohmic resistance Q.

The far station of the telegraph system is in all respects the same as the home station,

and the parts similar to the home station parts have similar small letters of reference apyfliedthercto. V

The telephone, transmission and receiving devices are arranged in any suitable way. For purposes of illustration, a simple batter arrangement is shown, in which 1-1 are telephone receivers in series with the line and secondaries 2-2, respectively.

3.3 are primariesin series with batteries l-4 and transmitters 5 -5, the primaries being shunted by condensers 6 -6."

The telephonic system is used and operated in the same manner as any ordinary telephone. 'llhefrequemry of the currents employed in transmitting the telephonic messages is so great that they easily pass detail but one such to the telegraphic appa- I through the condensers pass throu pedance c0- When the tel the sendin rent is fir rent key ogher than, 0 its windings phra the'sec'ondary G of thetran relay is one which by cha tions can' beused for sion or dn 1 switches S- connected n which case t e windi nected in multiple, to the ground T and connected in source,

g of messages by the key N t caused to pass through t mary'L,- which in turn induces e seconda 'ondary rise this being due to the mer is a closed havin that t what slo 'former havm loses its. Ina the primary circuit i one rise and one fa for every. closing of ti N and for ever mittin' key, and th each 0' osingas well as the transmitting key difl'erent telegraphic s which are received by the armatures ofwhichare actu impulse. The im of the transmitti and the impulses transmittin tion, and

y telephones which circuit, the. sudden static disch I fore found -objectiona eliminated and the fr like telegra to produce any an The relay B has win 'h the windings H to t e (:4? but will not the other windings H a the he A,fthe re: ghEthe differentially wound im- 7 lvafilitself not being energized by currents. 1

en the im ulsereache's the ,relay at the egraph system'is operated for farther end the current would in part urpass through allythel coils of the relayfin 7o e priseries tothe ound at i',-xand. in;pa"rt would a current in pass through alf ofthe coils in series to the: ry G. This current in the secdividing point, from which it would pass to and falls gradually, the groundat t .';..The currents in" all the fact that the trans for-; coils would coeperatein'energi'zing the relay 7 5 magnetic circuit transformer nd c u ing its armata e'tobengdve 1 high impedance in the primary so I It 1s'tob e noted thatthe dQVIQB' dQSCI'ibG d rimary current itself rises some-- s qlllreslllo p016 changers, that for"th a'tv wly, and to the fact that a transreason dugl x pera i nc e tained a d gamagnetic circuit of thist somewhat slowly a s opened, There willbe any other circuit, eXceptjwhen-a signal is secondary cur-; belng. produced. It isvfurther to be noted 0 'transmitt' y opening of the trans-' current at-each end, thereby ehnan'ating the 5 ulses produced by Second source of current, whichfhas heretoy'eachopening of -fore been "found to. be necessary in duplex .areused for impressing operation. i

ls oer thev line On account of the impulses which are relays, liabletobe impressed u on the line .by.elec 9o h each trical dischargepf parali pulses due to the c osings WllI' produce "currents of. greater or less key .are inone direction, Strength in the telegraphic c1rcuit,jand there ueto the openings of the s fore interfere with the proper action of the re 'inthe opposite. direcrelay, 3 ,I being of the, wave-like form lays-- above described and being of lowe uency than the telep t on h the windings ofthe' woun impedance coil E and counter oppositionin the 'im that due to the-#0 pe is obtaine without having a continuous curr rent passingthrc'nighltherelay. or through that the system requires-but one source'oii elconductors, which re e'y wheels W-w -supported by f fre springs W -w' bearing upon the upper end honic fr uency, of the 'armatures X-w which maintains'the 'fierentially armature at. rest from such false currents at do :not en'- eitherlimit of its movement, but is' so adpedance coil usted as to yield when the" currents used in hmi'c resistance transmitting the tele aphic impulses are or noticeably affect the diasent over the line. may betm S, s s"are moved so as to enga e the other ere 0- en the, swltches S- contact points the coils in the re ay are disble' ientirelyconnected from the grounds at Tt' and encypf thewav er are all placed in series, in which case the such as not system works as a-single-syst'em.v

.: My invention permits of various; modifica-" dingsin series with demand. various changes in the means for s'former. .This vemploying thgdprincipl'es and improvements nging the (amine abpve'describ single transmissp1r1t. 1 ex transmission With the .What I claim is:

P sitions shown, it is. 1. In a combined telephone and telegraph ex transmission, in system ngs in the relayare contor,- teiephonic apparatus. connected therewithout departing from its the combination of a main conducone halibeing connected w th, means for impressing upon said line through a suitable resistance telegraphicsignals each due to a sin la ineap'acity-U,-and the other set being duced electrical im ulse of. rounde wave series with the line'A. These form, andan imped two sets of windings are'equal when opposaid conductor and said telegra hic apparaance coil in series with .site, so that when they" are both traversed tus and located between said to e a hic a byequalcurrentsgderived from a common paratus and the pointat whic ii thejrelay, is not ene -for instance, du is sent. fromvt current at ing throu etee-- rgized, Thus, phonic apparatus is connected successive im- 'ex operation when a pulses being of op osite direction. Y a left hand station the 2.. In a combine telephonic and telegrap the relay B" is divided, art passf system the combination of a main conduc: ound tor, tele honic apparatus connected thereat T, an the other part passing t rough I with, sai conductor being grounded at each vide for the. armature: of the re- 95 'end, a coil inseries with'said conductor, a

lays and jockeys for the armatures of said relays.

3, In a combined telephone and telegraph system theconibina-tionof a .main conduc- It is hereby certified that in upon the applicatiouof George ment in coil, a closed magnetic circuit common to said coils, a telegraph key and battery in series with said second coil, an impedance coil located in the ground connection between said first coil and the point to which the telegraphic apparatus is connected receiving relays and j ockeys for of said relays.

, GEO, E. HINEs.

o tor, telephonic apparatus connected therewith, said conductor being grounded at each Witnesses:

end, a coil in series with said conductor, a D F. MALLEN, second coil in inductive relation to said first J. T. EWING.

Letters Patent No. 954,734, granted April 12, 1910,

E. Hines, of New York, N. Y., for an improve- A Combined Telephone and Telegraph System, an error appears in the printed specification requiring correction asfollows: Page 1, line 87, the words an ohmic resistance Q should be stricken out and the words a source of constant current M inserted instead; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent the armatures 20 in Letters Patent No. 954,734.

Signed and sealed this 10th day of May, A. D., 1910.

C. C. BILLINGS,

, c Acting Oommissa'oner of Patents.

[SEAL] Correction 'end, a coil inseries with'said conductor, a

lays and jockeys for the armatures of said relays.

3, In a combined telephone and telegraph system theconibina-tionof a .main conduc- It is hereby certified that in upon the applicatiouof George ment in coil, a closed magnetic circuit common to said coils, a telegraph key and battery in series with said second coil, an impedance coil located in the ground connection between said first coil and the point to which the telegraphic apparatus is connected receiving relays and j ockeys for of said relays.

, GEO, E. HINEs.

o tor, telephonic apparatus connected therewith, said conductor being grounded at each Witnesses:

end, a coil in series with said conductor, a D F. MALLEN, second coil in inductive relation to said first J. T. EWING.

Letters Patent No. 954,734, granted April 12, 1910,

E. Hines, of New York, N. Y., for an improve- A Combined Telephone and Telegraph System, an error appears in the printed specification requiring correction asfollows: Page 1, line 87, the words an ohmic resistance Q should be stricken out and the words a source of constant current M inserted instead; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent the armatures 20 in Letters Patent No. 954,734.

Signed and sealed this 10th day of May, A. D., 1910.

C. C. BILLINGS,

, c Acting Oommissa'oner of Patents.

[SEAL] Correction Correction in letters Patent No. 954,734.

It is hereby certified that in Letters Patent No. 954,734, granted April 12, 1910, upon the application of George E. Hines, of New York, N. Y., for an improvement in A Combined Telephone and Telegraph System, an error appears in the printed specification requiring correction as follows: Page 1, line 87, the words an ohmic resistance Q, should be stricken out and the words current M inserted instead; and that the said Letters Patent should source of 60118150416 he read with this correction therein that the same mey conform to the record of the case in the Patent Office.

Signed and sealed this 10th day of May, A. D., 1910.

[emu] C. (J. BILLINGS,

Acting O'mnmissz'oner of Patents. 

